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Built 383 stroker 3x2 or 6x2

Discussion in 'The Hokey Ass Message Board' started by longstory1948gmc, Jul 3, 2014.

  1. longstory1948gmc
    Joined: Apr 23, 2014
    Posts: 111

    longstory1948gmc
    Member
    from n Illinois

    Hi guys I am wondering about what setup and carbeurator to use on a heavily built 383 stroker. It normally puts out around 550-600 hp with a big cam and racing pistons. i wanna go hotrod and found a 3x2 and 6x2 but I don't know what to do for carbs. thanks


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  2. aaggie
    Joined: Nov 21, 2009
    Posts: 2,531

    aaggie
    ALLIANCE MEMBER

    If you want performance go with a single large four barrel and a dual plane manifold. Single plane if you want more top end.
     
  3. I would run a 2x4 if it were mine (not on a tunnel).

    I guess what you go to for carbs is going to depend on your tuning ability. I guess if it is built to the hilt your average 3x2 is not going to let it breath, but a 6x2 with Rochester 2Gs will work really well. It is going to be a nightmare to get dialed in and you will need to get secondary specific carbs for your 4 outboard carbs but once you get it done it will be sweet.
     
  4. Mr48chev
    Joined: Dec 28, 2007
    Posts: 30,068

    Mr48chev
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    I'd go with the 2x4 too. 2x3 isn't bad but 6x2 makes it a trailer queen for 99% of the guys around. Damned few people around who can tune that setup for the street to where you will want to make any road trips with it. The gas station operators would love you though.
     

  5. longstory1948gmc
    Joined: Apr 23, 2014
    Posts: 111

    longstory1948gmc
    Member
    from n Illinois

    I am planning on it being my daily driver and the 6x2 won't work for me through resurch but either a single quad or a 2x3 I also want mpg without going efi.


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  6. RustyNCA
    Joined: Feb 18, 2009
    Posts: 406

    RustyNCA
    Member

    I can't comment about mpg, I have never really checked it, but our non-stock 400 SBC runs pretty good with the 6x2 we have. I did have to spend time getting it dialed in, and it is sensitive to elevation changes, but starts up pretty decent, has no dead spots. I do think she starts to run out of carb on the top, but you can't hold it up there for very long or you are going way to fast on the street.

    [​IMG]
     
  7. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,615

    Ebbsspeed
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    "550-600 hp with a big cam and racing pistons" carbureted daily driver, and you want MPG?

    Good luck with that......
     
  8. longstory1948gmc
    Joined: Apr 23, 2014
    Posts: 111

    longstory1948gmc
    Member
    from n Illinois

    My dad got 15-25 mpg with lt1 efi. how many cfm do u guys run on your 6x2 and what carbs?


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  9. RustyNCA
    Joined: Feb 18, 2009
    Posts: 406

    RustyNCA
    Member

    So true, the only way to do run that kind of hp and get any mpg is run a gm lsx/lq4 motor and 4l60e trans.

    That's why I never even looked at my mpg, I don't really want to know, it's for fun.
     
  10. RustyNCA
    Joined: Feb 18, 2009
    Posts: 406

    RustyNCA
    Member

    Well, I am running Stromberg 97s which I am told are around 155 cfm each. So when I am running 6 I am around 930 cfm and on just four, 620 cfm. Currently I am just running the outer four and she seems pretty happy with it, except when I spin it over 4k to near 5k she starts to act like she needs more cfm.
     
  11. longstory1948gmc
    Joined: Apr 23, 2014
    Posts: 111

    longstory1948gmc
    Member
    from n Illinois

    Ya that's what I found also I would like to have all of them running that's the thing. I found a complete setup on craigslist for 1000 and there are ford 94s and 97s is that a good deal?


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  12. longstory1948gmc
    Joined: Apr 23, 2014
    Posts: 111

    longstory1948gmc
    Member
    from n Illinois

    How good are cross rams it would be easier for me to do a cross ram and the guy has one of those too but I've heard they are only good over 4k.


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  13. gimpyshotrods
    Joined: May 20, 2009
    Posts: 18,777

    gimpyshotrods
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    Cross rams can be a reversion nightmare.
     
  14. Mat Thrasher
    Joined: Nov 5, 2007
    Posts: 1,166

    Mat Thrasher
    Member

    Go with the 6x2 you'll need it to get enough cfm especially if you're using 94's or 97's.

    Why would a 6x2 setup make it a trailer queen? When I set mine up I just looked at like one big carb. The center 2 carbs are the primaries and the outer 4 are the secondaries. Just like a single 4 barrel primary and secondaries. Or you could look at it like 2 ImageUploadedByH.A.M.B.1404438460.856269.jpg 3x2 setups side by side.

    Also why would it use anymore fuel then any other setup if the mixture is right?

    Sure a single 4 barrel is easier. But 6 carbs is a hot rod!


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  15. longstory1948gmc
    Joined: Apr 23, 2014
    Posts: 111

    longstory1948gmc
    Member
    from n Illinois

    So is 1,000 good for a offenhauser vintage intake with all linkages and 94 and 97 carbs?


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  16. 5wcoupehunter
    Joined: Oct 20, 2007
    Posts: 919

    5wcoupehunter
    Member
    from FLORIDA

    I drive my coupe every day with a blower and 6x2 and a 5 speed it runs great gets pretty good gas milage starts right away.when I was building my coupe the local (Hot ROD) guys said there was no way I could drive my car every day because it had six carbs, guess what they were wrong. build your car just how you want. it takes time to get the bugs out. Don't give up.
     

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  17. longstory1948gmc
    Joined: Apr 23, 2014
    Posts: 111

    longstory1948gmc
    Member
    from n Illinois

    Ya I am only 15 you have to understand and my dad is a car guy and thinks it's a little ridiculous to spend that much but that would complete my hole build. I want vintage old school hotrod feel in my truck and that's what I want. The money aspect kills tho I would need to work it off if I bought it. I also just bought a front suspension for 1600


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  18. gimpyshotrods
    Joined: May 20, 2009
    Posts: 18,777

    gimpyshotrods
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  19. desotot
    Joined: Jan 29, 2008
    Posts: 1,879

    desotot
    Member

    I'd be happy to be 55 again, 6x2 gives the max cool factor, ran mine for over ten years with 94s, once you learn them its a blast.
     
  20. Mat Thrasher
    Joined: Nov 5, 2007
    Posts: 1,166

    Mat Thrasher
    Member

    I would think a $1000 is in the ballpark. I don't follow the prices on 94's and 97's but I believe the cores alone are $100 a piece. Plus a new linkage is a $200.



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  21. longstory1948gmc
    Joined: Apr 23, 2014
    Posts: 111

    longstory1948gmc
    Member
    from n Illinois

    Ok then all I have to do is get the money together and convince my dad.


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